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STTS424BDA3E Datasheet(PDF) 2 Page - STMicroelectronics

Part # STTS424BDA3E
Description  Memory module temperature sensor
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
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STTS424BDA3E Datasheet(HTML) 2 Page - STMicroelectronics

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Description
STTS424
2/7
Description
The STTS424 is targeted for DIMM modules in Mobile Personal Computing Platforms
(Laptops), Server Memory Modules, and other industrial applications. The thermal sensor
(TS) in the STTS424 is fully compliant to the JEDEC 42.4 specification which defines
Memory Module Thermal Sensors requirements for Mobile platforms.
The TS provides space as well as cost savings for Mobile and Server Platform Dual Inline
Memory Modules (DIMM) manufacturers, as it is packaged in the compact 2mm x 3mm 8-
lead DFN package which has a height that will not exceed 0.9mm. It is also available in the
JEDEC compliant TSSOP8 package.
The temperature sensor includes a band gap-based temperature sensor and 10-bit Analog-
to-Digital Converter (ADC) which monitor and digitize the temperature to a resolution of up
to 0.25°C. The typical accuracies over these temperature ranges are:
±3°C (max) over the full temperature measurement range of –40°C to 125°C,
±2°C in the +40°C to +125°C temperature range, and
±1°C in the +75°C to +95°C temperature range.
The temperature sensor in the STTS424 is specified for operating at supply voltages from
2.7V to 3.6V. Operating at 3.3V, the supply current is 100µA (typ).
The on-board sigma delta ADC converts the measured temperature to a digital value that is
calibrated in °C. For Fahrenheit applications, a lookup table or conversion routine is
required. The STTS424 is factory-calibrated and requires no external components to
measure temperature.
The digital temperature sensor component has user-programmable registers that provide
the capabilities for DIMM temperature-sensing applications. The open drain Event output pin
is active when the monitoring temperature exceeds a programmable limit, or it falls above or
below an alarm window. The user has the option to set the Event output as a critical
temperature output. This pin can be configured to operate in either a comparator mode for
thermostat operation or in interrupt mode.


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